CN108111245B - Optical fiber transport channel clock system and its method - Google Patents
Optical fiber transport channel clock system and its method Download PDFInfo
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- CN108111245B CN108111245B CN201710831407.2A CN201710831407A CN108111245B CN 108111245 B CN108111245 B CN 108111245B CN 201710831407 A CN201710831407 A CN 201710831407A CN 108111245 B CN108111245 B CN 108111245B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1611—Synchronous digital hierarchy [SDH] or SONET
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1652—Optical Transport Network [OTN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0075—Arrangements for synchronising receiver with transmitter with photonic or optical means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
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- Synchronisation In Digital Transmission Systems (AREA)
- Optical Communication System (AREA)
Abstract
A kind of optical fiber transport channel clock system, comprising: for the SYNC resampling subsystem that different distant-end nodes distribute optical electrical, electrical/optical conversion and the signal transmission subsystem transmitted of the clock of clock and SYNC signal with SYNC processing subsystem, for completing signal, the clock phase for adjusting clock phase in real time adjusts subsystem, is aligned for completing the phase of clock and SYNC again.Wherein, the clock and SYNC processing subsystem include clock cycle delay distribution module, SYNC distribution and receiving module；The signal transmission subsystem includes that electricity turns optical module, optical fiber transmission module, light turn electric module；It includes phase-locked loop module, variable phase delay module that the clock phase, which adjusts subsystem,.The invention also includes the methods for using optical fiber transport channel clock system.The present invention can efficiently accomplish that all far-end measuring nodes are synchronous with the clock of local data processing center, sample-synchronous function, be adapted to the optical fiber of different length, system structure is simple.
Description
Technical field
The present invention relates to the clock synchronizing method of multi-channel optical fibre transmission channel and devices.
Background technique
Optical fiber is as a kind of novel transmission medium, compared with traditional copper cable, has many clear advantages, such as
Good confidentiality, electromagnetism interference, Antiradiation, size be small, light-weight etc., so that optical fiber is in civil and military electronic system
More and more applications are arrived.In field of radar, as an important development direction of phased-array radar, Digital Array Radar is adopted
It with distributed emission and receives, transmitting-receiving node number is more, and transmitted data amount is big, favorably realizes number with optical fiber in engineering
The precedent of array radar large-capacity data transmission, but due to long optical fibers such as uses, so that application range is substantially reduced.Using not
Equal long optical fibers need to solve there are still many problems in engineering as data transmission channel.In field of power system, need
The parameters such as the real time measure temperature, electric current, such as the detection of stator, temperature of rotor to high-tension transformer and large-size machine, due to
Site environment electromagnetic interference is complicated, and traditional copper conductor data laser propagation effect is poor, will gradually be substituted by optical fiber transmission, such as divide
Cloth fibre optic temperature sensor just has been developed in recent years a kind of new and high technology for real-time measurement space temperature field.
Due to optical fiber have the advantages that it is very more so that all distributed measurement and control systems as described above are adopted more and more
Use optical fiber as the transmission medium of data and clock.All measuring nodes are spatially separated from each other and hand between each other without information
Mutually, all measuring nodes carry out physical connection by optical fiber with data processing centre.However, each biography of distributed measurement and control system
It is many that there are optical fiber conveying length Length discrepancy, optical fiber properties to change to external temperature and humidity in defeated channel, mechanical oscillation are very sensitive etc.
Problem so that distributed measurement and control system using optical fiber realize mass rapid transmission there are the clock of interchannel is asynchronous, clock
Asynchronous will lead to can not accomplish to send and receive signal simultaneously between measuring and controlling node, deteriorate the overall performance of system, even
System is caused to can not work normally.Therefore it needs a set of to correct the bearing calibration of clock inconsistency and dress between system channel
It sets, but there is no feasible implementation so far.
Summary of the invention
The present invention will overcome existing distributed measurement and control system to deposit when realizing large-scale data transmission using optical fiber transmission technique
The interchannel clock inconsistency the problem of, propose it is a kind of without obtaining fiber lengths in advance, can automatic measurement simultaneously correct optical fiber
The optical fiber transport channel clock system and method for transmission channel clock inconsistency.
Above-mentioned purpose of the invention can be achieved by following technical proposals:
A kind of optical fiber transport channel clock system, comprising: be that different distant-end nodes distribute clock and SYNC signal
Optical electrical of the clock with SYNC processing subsystem, for completing signal, is used for the signal transmission subsystem of electrical/optical conversion and transmission
The clock phase for adjusting clock phase in real time adjusts subsystem, adopts again for completing the SYNC that the phase of clock and SYNC is aligned again
Subsystem.
Wherein, the clock includes: with SYNC processing subsystem
Clock cycle delay distribution module, for providing clock signal all the way for each far-end measuring node.With defeated
Postpone the phase detuning selection function of coarse adjustment out, minimum delay stepping is equal to the half of input clock cycle.Each output clock
Retardation can be separately provided.The value of the output retardation of the module is determined by SYNC distribution and receiving module.
SYNC distribution and receiving module receive simultaneously for providing SYNC signal all the way for each far-end measuring node
The SYNC signal that each far-end measuring node postbacks.It is experienced that the module can measure the SYNC signal sent and received
Clock periodicity, the value determine clock cycle delay distribution module per the retardation exported all the way.
The signal transmission subsystem includes:
Electricity turns optical module, for existing clock signal, SYNC signal in electrical signal form to be converted into optical signal.
Clock signal, SYNC signal are distributed to difference from local data processing center using optical fiber by optical fiber transmission module
Far-end measuring node.
Light turns electric module, for the optical signal of reception optical fiber transmission module, and is converted to electric signal.
The clock phase adjusts subsystem
Phase-locked loop module, for comparing the phase difference between the clock of transmission, received clock, output and the phase difference at
The adjusting voltage of direct ratio controls variable phase delay module.
Variable phase delay module respectively has a variable phase delay mould in clock transmission link and clock receives link
Block, the module are adjusted the control of voltage by phase-locked loop module, carry out phase delay to the clock signal of input.
The SYNC resampling subsystem, is present on each far-end measuring node, receives in local data processing
The clock signal and SYNC signal that the heart sends over, and SYNC signal and clock signal are carried out phase alignment.It exports newly
SYNC signal returns to local data processing center.
All far-end measuring nodes are using the SYNC signal received as trigger event, when the triggering event occurs, distal end
Measuring node starts to execute corresponding TT&C task.There is no limit different far-end measurings for number of the system to far-end measuring node
There is no limit at a distance from local data processing center for node.Each far-end measuring node is formed with local data processing center
The transmitting-receiving circuit of clock signal, SYNC signal.There is no data exchange between each far-end measuring node.In being handled by local data
The clock that the heart is completed between all far-end measuring nodes is synchronous with SYNC signal.
Further, in the SYNC distribution and receiving module, the measurement of the SYNC signal clock periodicity experienced
Method are as follows: while sending SYNC, SYNC distribution and receiving module reset internal counter, and in each clock signal
The value of counter is added 1 by rising edge.When SYNC distribution and receiving module receive the SYNC signal that far-end measuring node postbacks,
Counter stops adding up, and the value of counter is sent to clock cycle delay distribution module, to the period per clock output all the way
Delay number is adjusted.
Further, in the signal transmission subsystem, 4 class signals is shared and need to be transmitted by optical fiber, i.e., originally
Ground data processing centre is sent to the clock signal of far-end measuring node, SYNC signal, and far-end measuring node is back to local number
According to the clock signal of processing center, SYNC signal.There are two types of Physical realizations for the optical fiber transmission module, one is utilizing
Wavelength-division multiplex technique is respectively modulated to this 4 signals on the carrier wave of different wave length, and is transmitted on an optical fiber, knot
Structure is more complex, but can save number of fibers；The second is existing respectively in this 4 signal modulation to the carrier wave of phase co-wavelength
It is transmitted on different optical fiber, structure is simple, but is the need to ensure that 4 optical fiber are isometric.
Finally, clock and SYNC processing subsystem operate in local data processing center, the operation of signal transmission subsystem
In local data processing center and far-end measuring node, clock phase adjusts subsystem and operates in local data processing center
On, SYNC resampling subsystem operates on far-end measuring node.
Suitable for the method for optical fiber transport channel clock system above-mentioned, include the following steps:
After step 1, whole system reset power on, global reference clock input clock cycle postpones distribution module 2. SYNC
The output retardation of clock cycle delay distribution module 2 is set as 0 by distribution and receiving module 1, and clock cycle delay distributes mould
Block 2 is exported without delay per reference clock all the way, and reference clock enters SYNC distribution and receiving module 1 all the way, when referring to all the way
Clock enters phase-locked loop module 3, variable phase delay module 4a.
Step 2, into variable phase delay module 4a reference clock signal will be turned by electricity optical module 6a, optical fiber 7a,
Light turns electricity module 5a and is sent to far-end measuring node.When far-end measuring node obtains reference from the delivery outlet that light turns electric module 5a
Clock signal, and in this, as the reference clock benchmark of entire node.The reference clock will additionally be divided into two-way, input all the way
SYNC resampling module 8, another way enters electricity and turns optical module 6b, and gives local data processing center by fiber pass-back.
Step 3, the randomness due to fiber lengths, the phase difference between two input signals of phase-locked loop module 3 are random
It is distributed between 0 °~360 °.Phase discriminator inside phase-locked loop module 3 compares the phase difference between two input signals, generates one
A signal proportional to the phase difference.Loop filter inside subsequent phase-locked loop module 3 contains line for what phase discriminator exported
The direct current signal of wave component equalizes, this is changed to the direct current signal less for alternating component, and range is 0~5V, locking phase ring moulds
The afterbody of block is the active loop filter that operational amplifier is constituted.The structure there are two types of selection, inversion topology and
Positive topological structure.The input impedance of inversion topology is low, is equivalent to and increases load to previous stage, changes locking phase ring moulds
The loop characteristics of block；Input impedance with phase topological structure is high, and prime will not be made to bear load；But use inversion topology
When, the phase discriminator in phase-locked loop module must have polarity reverse function, to offset inversion topology bring phasing back
Effect.With correct polarity driven variable phase delay module 4.Active loop filter puts 0~5V direct current signal of input
Greatly 0~12V DC signal, while inputting two variable phase delay modules 4a, 4b.
Step 4, variable phase delay module 4a, 4b change phase-delay quantity according to the size of the direct current signal of input, make
The output clock of variable phase delay module 4a, 4b generates the phase delay within the scope of 0~180 ° relative to input clock.When straight
When stream signal value is 0V, the phase-delay quantity of variable phase delay module 4 is 0 °, can be covert when direct current signal value is 12V
The phase-delay quantity of position Postponement module 4 is slightly larger than 180 °；Path from local data processing center to far-end measuring node has 1
Variable phase delay module 4a, from far-end measuring node to also thering is 1 variable phase to prolong on the path of local data processing center
Slow module 4b can cover 0~360 ° one just comprising two variable phase delay modules 4a, 4b on entire clock transfer circuit
The clock phase offset of a complete cycle.
Step 5, when variable phase delay module 4a, 4b changes the phase-delay quantity of itself, on far-end measuring node
The phase of reference clock reference signal also changes accordingly.Until the phase difference of two input signals of phase-locked loop module 3
It is 0 °, the output direct current signal of phase-locked loop module 3 no longer changes at this time, the phase-delay quantity of variable phase delay module 4a, 4b
Also no longer change, when the reference that the reference clock reference signal of far-end measuring node and clock cycle delay distribution module 2 export
Clock phase alignment.
Step 6, the inconsistency due to fiber lengths, the 10MHz that can also bring distal end local data processing center to send
Reference clock needs undergo different clock periodicities to get to each far-end measuring node on optical fiber.System needs at this time
Start SYNC distribution and receiving module 1 measures clock periodicity.SYNC distributes the rising edge with receiving module 1 in reference clock,
SYNC signal is set into height, while starting internal counter, the value of counter is added 1 in the rising edge of each reference clock.
Electricity turns optical module 6c and converts optical signal for the SYNC signal, and is transferred to far-end measuring node by optical fiber, turns electric mould by light
SYNC signal is become electric signal by block 5c, and is sent into SYNC resampling module 8.Since SYNC distribution and receiving module 1 are sent
SYNC signal be aligned with the rising edge of reference clock, send the link of reference clock than sending more than the link of SYNC
One variable phase delay module 4a, so that the reference clock for reaching far-end measuring node has lagged 0~180 ° than SYNC signal
Random phase in range, the effect of SYNC resampling module 8 on far-end measuring node is to eliminate this random phase offset,
So that the SYNC signal of output is realized again and the rising edge alignment of reference clock, as shown in Fig. 5.SYNC returns to local again
The SYNC distribution of data processing centre and receiving module 1, SYNC distribution at this time and receiving module 1 stop internal counter, count
The current value of device is twice of the clock periodicity that reference clock is undergone on simple optical fiber.
Step 7, SYNC distribution and receiving module 1 obtain at all far-end measuring nodes and local data according to step 6
The clock periodicity undergone on the optical fiber of hub interconnection is managed, each the output clock of clock cycle delay distribution module 2 is calculated
Cycle delay number of the port relative to global reference clock.Such as when the first far-end measuring node and local data processing center are mutual
Fiber lengths even are 65 meters, when the fiber lengths of the second far-end measuring node and local data center interconnection are 85 meters, SYNC
The clock cycle delay number corresponding to the first far-end measuring node that distribution and receiving module 1 measure is 8, corresponds to the second distal end
The clock cycle delay number of measuring node is 10.Clock cycle delay distribution module 2 sets the period of each output port at this time
Postpone number, the inconsistency of compensated optical fiber bring clock cycle delay number, if the output of time clock cycle delay distribution module 2 is given
The delay number of first far-end measuring node is N1, and exporting to the delay number of the second far-end measuring node is N2, then meeting 8+N1
=10+N2.
Beneficial effects of the present invention are mainly manifested in:
1) present invention does not need to increase additional optical fiber transport channel, only the phaselocked loop in the fiber bit clock transmission channel and
Variable phase delay module, so that it may realize the edge of the clock signal of all far-end measuring nodes and local data processing center
Alignment function；
2) clock cycle that can be completed between all far-end measuring nodes merely with SYNC signal and clock signal is different
Cause property calibration function；
3) SYNC signal can also serve as the trigger command of all far-end measuring nodes, complete all nodes synchronized sampling and
Output function；
4) present invention adapts to the optical fiber transport channel of various length, using optical fiber as transmission medium, electromagnetism interference
And strong security；It is connected between each node without any physical electrical, system structure is simple, and Project Realization is easy.
Detailed description of the invention
Fig. 1 is optical fiber transport channel clock system schematic diagram of the present invention.
Fig. 2 is correction module layout of the present invention and interconnection mode schematic diagram, and wherein fine line represents clock path, fine dotted line
Represent the path SYNC.
Fig. 3 is the inversion topology of active loop filter of the present invention.
Fig. 4 is the positive topological structure of active loop filter of the present invention.
Fig. 5 is SYNC resampling functions of modules schematic diagram of the present invention.
Fig. 6 is the relationship of controllable phase Postponement module control voltage and phase-delay quantity.
Specific embodiment
Invention is further illustrated with reference to the accompanying drawing.
A kind of common application scenarios of the invention as shown in Figure 1, system there are the far-end measuring node of multiple discrete distributions,
The optical fiber and local data processing center that they pass through Length discrepancy respectively are interconnected.Local data processing center is responsible for clock
Signal and SYNC signal as trigger event send all far-end measuring nodes to.System requirements reaches all far-end measurings
The clock of node keeps phase equalization, while all SYNC signals can reach all far-end measuring nodes in synchronization.
Referring to Figures 1 and 2, a kind of optical fiber transport channel clock system, comprising: distribute clock for different distant-end nodes
With the clock and SYNC processing subsystem of SYNC signal, the optical electrical for completing signal, the signal biography of electrical/optical conversion and transmission
Defeated subsystem, the clock phase for adjusting clock phase in real time adjust subsystem, the phase weight for completing clock and SYNC
The SYNC resampling subsystem of alignment.
Wherein clock and SYNC processing subsystem include: clock cycle delay distribution module 1, SYNC distribution and receiving module
2；Signal transmission subsystem includes: that electricity turns optical module 6, optical fiber transmission module 7, light turn electric module 5；Clock phase adjusts subsystem
It include: phase-locked loop module 3, variable phase delay module 4.
Due to the structure of all far-end measuring nodes be it is the same, only a far-end measuring node is illustrated.
Method is equally applicable to other far-end measuring nodes.
The 2 generation system reference clock signal of clock cycle delay distribution module of Fig. 2, while giving SYNC distribution and connecing
Receive the first input port of module 1, the first input port of phase-locked loop module 3, variable phase delay module 4a input port；It can be covert
The clock signal of position Postponement module 4a output is after turning optical module 6a, optical fiber transport channel 7a, light by electricity and turning electric module 5a
Reach far-end measuring node；CLK signal is divided into 3 tunnels by far-end measuring node, all the way when reference as far-end measuring node
Clock, all the way enter SYNC resampling module 8 the first input port, another way by electricity turn optical module 6b, optical fiber transport channel 7b,
Enter the second input port of phase-locked loop module 3 after the electric module 5b of light turn, variable phase delay module 4b；Phase-locked loop module 3 passes through
Compare the phase difference of the clock signal of the first input port and the second input port, export the adjusting voltage directly proportional to the phase difference,
Two variable phase delay modules 4a, 4b are controlled, thus change the phase-shift phase of two variable phase delay modules 4a, 4b, until
Phase difference between the signal of 3 two input ports of phase-locked loop module is 0, and entire circuit is in dynamic balance state, variable phase
The phase-shift phase of Postponement module 4a, 4b no longer change, the reference clock of far-end measuring node and the reference of local data processing center
The phase difference of clock is 0；Due to using multiple groups far-end measuring node, different measuring nodes use Length discrepancy optical fiber and local data
Processing center is connected, and the above method can guarantee the reference clock and local data processing center of each far-end measuring node
The phase difference of reference clock is 0, but Length discrepancy optical fiber will lead to from when the same reference that local data processing center is sent
Clock will undergo different reference clock cycles to count to up to different far-end measuring nodes；When needs measure and correct the periodicity
When, SYNC signal, the SYNC signal and reference clock rising edge alignment are generated by SYNC distribution and receiving module 1；SYNC signal
Turn to enter the SYNC resampling on far-end measuring node after optical module 6c, optical fiber transport channel 7c, light turn electric module 5c by electricity
Second input port of module 8；SYNC resampling module 8 the reference clock of the first input port rising edge to the second input port
SYNC signal carry out resampling, to eliminate the phase difference of variable phase delay module 4a bring reference clock and SYNC；
SYNC resampling module 8 exports new SYNC signal and is divided into two-way, another all the way as the SYNC signal on far-end measuring node
Road turns optical module 6d, optical fiber transport channel 7d, light a turn electricity module 5d by electricity and enters SYNC distribution and receiving module 1；SYNC points
Hair and receiving module 1 send SYNC by record and receive the reference clock number between SYNC, so that it may know local data
Reference clock cycle number between processing center and different far-end measuring nodes；SYNC distribution and receiving module 1 control clock
Cycle delay distribution module 2 makes clock cycle delay distribution module 2 for different far-end measuring nodes, compensates different
Clock cycle delay number finally makes different far-end measuring nodes have the same reference clock relative to global reference clock 9
Cycle delay amount.
Refering to fig. 1.In the embodiment described below, optical fiber transport channel clock system includes a local data
Processing center, multiple far-end measuring nodes, each node respectively use one group of 4 optical fiber and local data processing center to carry out clock
Transmission and SYNC control.Length discrepancy between every group of optical fiber, 4 optical fiber of every group of inside of optical fibre guarantee isometric.Local data processing
Center needs 10MHz reference clock being transferred to far-end measuring node, since the optical fiber interconnected with local data processing center is long
Degree is distributed in 60 meters~120 meters, and the signal transmission rate in optical fiber is about 2 × 108M/s, therefore 10MHz clock wave length about 2 ×
108/(10× 106) m=20m, being equivalent on optical fiber has the clock signal in 3~6 periods.Even if local data processing center exists
Reference clock is distributed to different far-end measuring nodes by synchronization, and by the effect of Length discrepancy optical fiber, reference clock also can
Different far-end measuring nodes is reached in different moments, it is asynchronous so as to cause clock between different far-end measuring nodes.Together
The problem of sample, exists in SYNC signal, since SYNC signal is used to send synchronization signal, warp to different far-end measuring nodes
The effect of Length discrepancy optical fiber is crossed, SYNC signal can equally reach different far-end measuring nodes in different moments, cause different
SYNC signal is asynchronous between far-end measuring node.
By taking the first far-end measuring node and local data processing center as an example, referring to Fig.2, specific implementation step is as follows:
1, after whole system reset powers on, global reference clock input clock cycle postpones distribution module 2.SYNC distribution
The output retardation of clock cycle delay distribution module 2 is set as 0 with receiving module 1,2 nothing of clock cycle delay distribution module
Lingeringly output is per reference clock all the way, and reference clock enters SYNC distribution and receiving module 1 all the way, and reference clock enters all the way
Phase-locked loop module 3, variable phase delay module 4a.
2, optical module 6a, optical fiber 7a, light will be turned by electricity into the reference clock signal of variable phase delay module 4a to turn
Electric module 5a is sent to far-end measuring node.Far-end measuring node obtains reference clock letter from the delivery outlet that light turns electric module 5a
Number, and in this, as the reference clock benchmark of entire node.The reference clock will additionally be divided into two-way, input SYNC weight all the way
Sampling module 8, another way enters electricity and turns optical module 6b, and gives local data processing center by fiber pass-back.
3, the phase difference random distribution due to the randomness of fiber lengths, between two input signals of phase-locked loop module 3
Between 0 °~360 °.Phase discriminator inside phase-locked loop module 3 compares the phase difference between two input signals, generate one with
The proportional signal of the phase difference.Loop filter inside subsequent phase-locked loop module 3 by phase discriminator export contain ripple at
This is changed the direct current signal less for alternating component by the direct current signal equalization divided, and range is 0~5V, phase-locked loop module
Afterbody is the active loop filter that operational amplifier is constituted.There are two types of selection, inversion topology and positives for the structure
Topological structure.The input impedance of inversion topology is low, is equivalent to and increases load to previous stage, changes phase-locked loop module
Loop characteristics, as shown in Fig. 3.Input impedance with phase topological structure is high, prime will not be made to bear load, such as 4 institute of attached drawing
Show.But when using inversion topology, the phase discriminator in phase-locked loop module must have polarity reverse function, to offset reverse phase
Topological structure bring phasing back effect.With correct polarity driven variable phase delay module 4.Active loop filter will
0~5V direct current signal of input is enlarged into 0~12V DC signal, while inputting two variable phase delay modules 4a, 4b.
4, variable phase delay module 4a, 4b changes phase-delay quantity according to the size of the direct current signal of input, makes can be changed
The output clock of phase delay module 4a, 4b generate the phase delay within the scope of 0~180 ° relative to input clock.When direct current is believed
When number value is 0V, the phase-delay quantity of variable phase delay module 4 is 0 °, when direct current signal value is 12V, variable phase delay
The phase-delay quantity of module 4 is slightly larger than 180 °.The control voltage of variable phase delay module and the relationship of phase-delay quantity are for example attached
Shown in Fig. 6.Because there is 1 variable phase delay module 4a in the path from local data processing center to far-end measuring node, from
Also there are 1 variable phase delay module 4b, entire clock transfer on far-end measuring node to the path of local data processing center
Just comprising two variable phase delay modules 4a, 4b on circuit, the clock phase that can cover 0~360 ° of complete cycle is inclined
Shifting amount.
5, the reference when variable phase delay module 4a, 4b changes the phase-delay quantity of itself, on far-end measuring node
The phase of clock reference signal also changes accordingly.Until phase-locked loop module 3 two input signals phase difference be 0 °,
The output direct current signal of phase-locked loop module 3 no longer changes at this time, and the phase-delay quantity of variable phase delay module 4a, 4b is also no longer
Variation, the reference clock phase that the reference clock reference signal and clock cycle delay distribution module 2 of far-end measuring node export
Alignment.
6, due to the inconsistency of fiber lengths, the 10MHz that can also bring distal end local data processing center to send is referred to
Clock needs undergo different clock periodicities to get to each far-end measuring node on optical fiber.System needs to start at this time
SYNC distribution and receiving module 1 measure clock periodicity.SYNC distribution and receiving module 1, will in the rising edge of reference clock
SYNC signal sets height, while starting internal counter, and the value of counter is added 1 in the rising edge of each reference clock.Electricity
Turn optical module 6c and convert optical signal for the SYNC signal, and far-end measuring node is transferred to by optical fiber, electric module is turned by light
SYNC signal is become electric signal by 5c, and is sent into SYNC resampling module 8.It is sent due to SYNC distribution and receiving module 1
SYNC signal is aligned with the rising edge of reference clock, has sent more than link of the link than transmission SYNC of reference clock one
A variable phase delay module 4a, so that the reference clock for reaching far-end measuring node has lagged 0~180 ° of model than SYNC signal
Interior random phase is enclosed, the effect of SYNC resampling module 8 on far-end measuring node is to eliminate this random phase offset, is made
The SYNC signal that must be exported is realized again and the rising edge alignment of reference clock, as shown in Fig. 5.SYNC returns to local number again
According to the SYNC distribution of processing center and receiving module 1, SYNC distribution at this time and receiving module 1 stop internal counter, counter
Current value be twice of the clock periodicity that reference clock is undergone on simple optical fiber.
7, SYNC distribution and receiving module 1 obtain in all far-end measuring nodes and local data processing according to step 6
The clock periodicity undergone on the optical fiber of heart interconnection calculates each the output clock port of clock cycle delay distribution module 2
Cycle delay number relative to global reference clock.Such as when the first far-end measuring node and the interconnection of local data processing center
Fiber lengths are 65 meters, when the fiber lengths of the second far-end measuring node and local data center interconnection are 85 meters, SYNC distribution
It is 8 with the clock cycle delay number corresponding to the first far-end measuring node that receiving module 1 measures, corresponds to the second far-end measuring
The clock cycle delay number of node is 10.Clock cycle delay distribution module 2 sets the cycle delay of each output port at this time
Number, the inconsistency of compensated optical fiber bring clock cycle delay number, if the output of time clock cycle delay distribution module 2 is to first
The delay number of far-end measuring node is N1, and exporting to the delay number of the second far-end measuring node is N2, then meeting 8+N1=10+
N2。
8, the optical fiber as used in SYNC signal and reference signal is isometric, and SYNC signal and reference clock are on optical fiber
Propagation time is the same, and SYNC distribution and receiving module 1 can use the clock periodicity that reference clock signal is undergone on optical fiber,
The SYNC signal transmission interval for being sent to different far-end measuring nodes is adjusted, allows all SYNC signals in the same time
Reach all far-end measuring nodes.
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, protection of the invention
Range should not be construed as being limited to the specific forms stated in the embodiments, and protection scope of the present invention is also and in art technology
Personnel conceive according to the present invention it is conceivable that equivalent technologies mean.
Claims (5)
1. a kind of optical fiber transport channel clock system, it is characterised in that: the clock system includes: for different distal ends
Node distribute clock and SYNC signal clock and SYNC processing subsystem, the optical electrical for completing signal, electrical/optical conversion and
The signal transmission subsystem of transmission, for adjust in real time clock phase clock phase adjust subsystem, for complete clock and
The SYNC resampling subsystem that the phase of SYNC is aligned again；
Wherein, the clock includes: with SYNC processing subsystem
Clock cycle delay distribution module, for providing clock signal all the way for each far-end measuring node；
Phase detuning selection function with output delay coarse adjustment, minimum delay stepping are equal to the half of input clock cycle, often
Retardation can be separately provided in a output clock, and the value of the clock output retardation of the module is distributed by SYNC and receiving module
It determines；
SYNC distribution and receiving module, for providing SYNC signal all the way for each far-end measuring node, while receiving each
The SYNC signal that a far-end measuring node postbacks；The module, which is measured, sends and receives the SYNC signal clock cycle experienced
Number, clock periodicity determine clock cycle delay distribution module per the retardation exported all the way；
The signal transmission subsystem includes:
Electricity turns optical module, for existing clock signal, SYNC signal in electrical signal form to be converted into optical signal；
Optical fiber transmission module from local data processing center is distributed to clock signal, SYNC signal different remote using optical fiber
Hold measuring node；
Light turns electric module, for the optical signal of reception optical fiber transmission module, and is converted to electric signal；
The clock phase adjusts subsystem
Phase-locked loop module exports directly proportional to the phase difference for comparing the phase difference between the clock of transmission, received clock
Adjusting voltage, control variable phase delay module；
Variable phase delay module respectively has a variable phase delay module in clock transmission link and clock receives link,
The module is adjusted the control of voltage by phase-locked loop module, carries out phase delay to the clock signal of input；
The SYNC resampling subsystem, is present on each far-end measuring node, receives local data processing center hair
The clock signal and SYNC signal brought, and SYNC signal and clock signal are carried out phase alignment；Export new SYNC letter
Number return to local data processing center；
Far-end measuring node is using the SYNC signal received as trigger event, when the triggering event occurs, far-end measuring node
Start to execute corresponding TT&C task；Far-end measuring node all forms clock signal, SYNC signal with local data processing center
Transmitting-receiving circuit；There is no data exchange between far-end measuring node；By local data processing center complete far-end measuring node it
Between clock it is synchronous with SYNC signal.
2. optical fiber transport channel clock system as described in claim 1, it is characterised in that: the SYNC distribution and reception
The mode of the clock periodicity of module measurement SYNC signal experience is: while sending SYNC, SYNC distribution and receiving module
Internal counter is reset, and the value of counter is added 1 in the rising edge of each clock signal；When SYNC distribution and receiving module
When receiving the SYNC signal that far-end measuring node postbacks, counter stops adding up, and the value of counter is sent to the clock cycle
Postpone distribution module, the cycle delay number per clock output all the way is adjusted.
3. optical fiber transport channel clock system as described in claim 1, it is characterised in that: the signal transmits subsystem
In system, share 4 class signals and need to be transmitted by optical fiber, i.e., local data processing center be sent to far-end measuring node when
Clock signal, SYNC signal, clock signal of the far-end measuring node back to local data processing center, SYNC signal.
4. optical fiber transport channel clock system as described in claim 1, it is characterised in that: clock and SYNC handle subsystem
System operates in local data processing center, and signal transmission subsystem operates in local data processing center and far-end measuring node
On, clock phase adjusts subsystem and operates in local data processing center, and SYNC resampling subsystem operates in far-end measuring
On node.
5. being suitable for the method for optical fiber transport channel clock system described in claim 1, include the following steps:
After step 1, whole system reset power on, global reference clock input clock cycle postpones distribution module (2)；SYNC distribution
The output retardation of clock cycle delay distribution module (2) is set as 0 with receiving module (1), clock cycle delay distributes mould
Block (2) is exported without delay per reference clock all the way, and reference clock enters SYNC distribution and receiving module (1) all the way, is joined all the way
It examines clock and enters phase-locked loop module (3), variable phase delay module (4a)；
Step 2 will turn optical module (6a), optical fiber into the reference clock signal of variable phase delay module (4a) by electricity
(7a), light turn electric module (5a) and are sent to far-end measuring node；Far-end measuring node is obtained from the delivery outlet that light turns electric module (5a)
Reference clock signal is obtained, and in this, as the reference clock benchmark of entire node；The reference clock will additionally be divided into two-way, and one
Road inputs SYNC resampling module (8), and another way enters electricity and turns optical module (6b), and gives local data processing by fiber pass-back
Center；
Step 3, the randomness due to fiber lengths, the phase difference between two input signals of phase-locked loop module (3) divide at random
It is distributed between 0 ° ~ 360 °；The internal phase discriminator of phase-locked loop module (3) compares the phase difference between two input signals, generates one
A signal proportional to the phase difference；The internal loop filter of subsequent phase-locked loop module (3) contains what phase discriminator exported
The direct current signal of ripple component equalizes, this is changed to the direct current signal less for alternating component, and range is 0 ~ 5V, locking phase ring moulds
The afterbody of block is the active loop filter that operational amplifier is constituted；There are two types of selection, reverse phases for phase-locked loop module (3) structure
Topological structure and positive topological structure；The input impedance of inversion topology is low, is equivalent to and increases load to previous stage, changes
The loop characteristics of phase-locked loop module；Input impedance with phase topological structure is high, and prime will not be made to bear load；It is opened up using reverse phase
When flutterring structure, the phase discriminator in phase-locked loop module must have polarity reverse function, to offset inversion topology bring phase
Bit reversal effect；With correct polarity driven variable phase delay module 4；Active loop filter believes 0 ~ 5V direct current of input
It number is enlarged into 0 ~ 12V DC signal, while inputting two variable phase delay modules (4a, 4b)；
Step 4, variable phase delay module (4a, 4b) change phase-delay quantity according to the size of the direct current signal of input, and making can
The output clock of changeable phases Postponement module (4a, 4b) generates the phase delay within the scope of 0 ~ 180 ° relative to input clock；When straight
When stream signal value is 0V, the phase-delay quantity of variable phase delay module (4) is 0 °, can be covert when direct current signal value is 12V
The phase-delay quantity of position Postponement module (4) is slightly larger than 180 °；Path from local data processing center to far-end measuring node has 1
A variable phase delay module (4a), from far-end measuring node to also have on the path of local data processing center 1 can be covert
Position Postponement module (4b), just comprising two variable phase delay modules (4a, 4b) on entire clock transfer circuit, it can cover 0 ~
The clock phase offset of 360 ° of complete cycles；
Step 5, the ginseng when variable phase delay module (4a, 4b) changes the phase-delay quantity of itself, on far-end measuring node
The phase for examining clock reference signal also changes accordingly；Until the phase difference of two input signals of phase-locked loop module (3)
It is 0 °, the output direct current signal of phase-locked loop module (3) no longer changes at this time, and the phase of variable phase delay module (4a, 4b) is prolonged
Amount also no longer changes late, reference clock reference signal and clock cycle delay distribution module (2) output of far-end measuring node
Reference clock phase alignment；
Step 6, the inconsistency due to fiber lengths, the 10MHz reference that can also bring distal end local data processing center to send
Clock needs undergo different clock periodicities to get to each far-end measuring node on optical fiber；System needs to start at this time
SYNC distribution and receiving module (1) measure clock periodicity；SYNC distributes the rising edge with receiving module (1) in reference clock,
SYNC signal is set into height, while starting internal counter, the value of counter is added 1 in the rising edge of each reference clock；
Electricity turns optical module (6c) and converts optical signal for the SYNC signal, and is transferred to far-end measuring node by optical fiber, turns electricity by light
SYNC signal is become electric signal by module (5c), and is sent into SYNC resampling module (8)；Due to SYNC distribution and receiving module
(1) SYNC signal sent is aligned with the rising edge of reference clock, sends chain of the link of reference clock than sending SYNC
The more variable phase delay modules (4a) in road, so that the reference clock for reaching far-end measuring node is lagged than SYNC signal
Random phase within the scope of 0 ~ 180 °, SYNC resampling module (8) effect on far-end measuring node is to eliminate this random phase
Position deviation, so that the SYNC signal of output is realized and the rising edge alignment of reference clock again；SYNC returns to local data again
The SYNC distribution of processing center and receiving module (1), SYNC distribution at this time and receiving module (1) stop internal counter, count
The current value of device is twice of the clock periodicity that reference clock is undergone on simple optical fiber；
Step 7, SYNC distribution and receiving module (1) obtain all far-end measuring nodes and local data processing according to step 6
The clock periodicity undergone on the optical fiber of hub interconnection calculates each output clock of clock cycle delay distribution module (2)
Cycle delay number of the port relative to global reference clock；Clock cycle delay distribution module (2) sets each output end at this time
The cycle delay number of mouth, the inconsistency of compensated optical fiber bring clock cycle delay number, if time clock cycle delay distributes mould
It is N1 that block (2), which is exported to the delay number of the first far-end measuring node, and exporting to the delay number of the second far-end measuring node is N2, that
Meet 8+N1=10+N2；
Step 8, the optical fiber as used in SYNC signal and reference signal are isometric, and SYNC signal and reference clock are on optical fiber
Propagation time is the same, and SYNC distribution and receiving module (1) can use the clock cycle that reference clock signal is undergone on optical fiber
Number adjusts the SYNC signal transmission interval for being sent to different far-end measuring nodes, allows all SYNC signals same
Time reaches all far-end measuring nodes.
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| CN108988858B (en) * | 2018-08-23 | 2022-11-18 | 上海联影医疗科技股份有限公司 | Clock distribution system and method |
| CN111385047B (en) * | 2018-12-28 | 2023-05-05 | 中兴通讯股份有限公司 | Time synchronization method and electronic equipment |
| CN109683658A (en) * | 2018-12-30 | 2019-04-26 | 广东大普通信技术有限公司 | A kind of clock signal phase control device and method |
| CN109640389A (en) * | 2018-12-30 | 2019-04-16 | 广东大普通信技术有限公司 | A kind of method and apparatus of delay compensation |
| CN110543121A (en) * | 2019-08-30 | 2019-12-06 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Instruction synchronous distribution control device of full-digital phased array system |
| CN110749865B (en) * | 2019-09-28 | 2022-07-05 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Method for reducing zero second delay fluctuation of coherent measurement equipment |
| CN110708133B (en) * | 2019-09-29 | 2021-07-27 | 杭州晨晓科技股份有限公司 | Method and device for clock synchronization and time synchronization in system based on FPGA |
| CN111654346B (en) * | 2020-04-17 | 2023-02-28 | 江苏艾科半导体有限公司 | Independent synchronous clock module based on optical serial port |
| CN114650124B (en) * | 2020-12-18 | 2023-10-03 | 中国联合网络通信集团有限公司 | Synchronization method and device for data transmission |
| CN114640327B (en) * | 2022-05-11 | 2022-09-27 | 上海燧原科技有限公司 | Clock phase control circuit and chip |
| CN115801175B (en) * | 2023-01-30 | 2023-05-23 | 国仪量子(合肥)技术有限公司 | Time-frequency synchronization method, system, storage medium and electronic equipment |
| CN116846530B (en) * | 2023-06-29 | 2024-03-19 | 北京邮电大学 | Optical switching network based on whole network clock frequency synchronization, data transmitting and receiving method |
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